to stop up or close off a flow of water, so that it does not escape (see Molina)
Orthographic Variants:
atzaqua
IPAspelling:
ɑːtsɑkwɑ
Alonso de Molina:
atzaqua. n. (pret. onatzacu.) atapar o cerrar el agua, paraque no se salga. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 9r. col. 1. Thanks to Joe Campbell for providing the transcription.